List of journal names' abbreviations (one among others...)

http://www.lib.berkeley.edu/BIOS/j_abbr.html

bibtex tricks

description of format: http://www.bibtex.org/Format/
trees locations: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=what-TDS

perl multiple "or" statements

Apparently in perl, multiple "or" are synced if the result is used in a replacement. E.g.:

s/(a|b)some_text(x|y)/\1new_text\2/g

will only find and replace

a(some_text)x
b(some_text)y

and no permutations of these !

bring emacs closer to your bash shell

Environment variables:

http://stackoverflow.com/questions/9663396/how-do-i-make-emacs-recognize-bash-environment-variables-for-compilation

(let ((path (shell-command-to-string ". ~/.bashrc; echo -n $PATH")))
  (setenv "PATH" path)
  (setq exec-path 
        (append
         (split-string-and-unquote path ":")
         exec-path)))

Autocompletion: 

https://github.com/szermatt/emacs-bash-completion

(autoload 'bash-completion-dynamic-complete 
  "bash-completion"
  "BASH completion hook")
(add-hook 'shell-dynamic-complete-functions
  'bash-completion-dynamic-complete)
(add-hook 'shell-command-complete-functions
  'bash-completion-dynamic-complete)

ImageJ stdev

The standard deviation function in ImageJ (1.47v tested) is computing the sample standard deviation (divided by N-1).